CA2282221C - Two-surface constrainable tool - Google Patents
Two-surface constrainable tool Download PDFInfo
- Publication number
- CA2282221C CA2282221C CA002282221A CA2282221A CA2282221C CA 2282221 C CA2282221 C CA 2282221C CA 002282221 A CA002282221 A CA 002282221A CA 2282221 A CA2282221 A CA 2282221A CA 2282221 C CA2282221 C CA 2282221C
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- CA
- Canada
- Prior art keywords
- collar
- spindle
- constrainable
- end surface
- tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/008—Chucks; Expansion mandrels; Adaptations thereof for remote control with arrangements for transmitting torque
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/006—Conical shanks of tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2231/00—Details of chucks, toolholder shanks or tool shanks
- B23B2231/02—Features of shanks of tools not relating to the operation performed by the tool
- B23B2231/0292—Flanges of conical shanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2260/00—Details of constructional elements
- B23B2260/10—Magnets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2260/00—Details of constructional elements
- B23B2260/114—Rings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/94—Tool-support
- Y10T408/95—Tool-support with tool-retaining means
- Y10T408/957—Tool adapter
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T409/00—Gear cutting, milling, or planing
- Y10T409/30—Milling
- Y10T409/309352—Cutter spindle or spindle support
- Y10T409/309408—Cutter spindle or spindle support with cutter holder
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T409/00—Gear cutting, milling, or planing
- Y10T409/30—Milling
- Y10T409/30952—Milling with cutter holder
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping On Spindles (AREA)
- Jigs For Machine Tools (AREA)
Abstract
A two-surface constrainable tool has two retaining surfaces by which the two-surface constrainable tool retains itself on a spindle (10) of a machine tool . The two-surface constrainable tool comprises : a bottom grip taper shank (14) having a taper part (15) having a first retaining surface and capable of being closely fitted in a taper bore (12) formed in the spindle (10), and a flange (16) provided in one end surface (16a) thereof facing the end surface (10a) of the spindle (10) with a groove (18); and a collar (20) to be interposed between the end surface (16a) of the flange (16) and the end surface (10a) of the spindle (10), consisting of two symmetrical segments (20a, 20b) having ridges (22a, 22b) to be fitted in the groove (18) of the flange (16), and a second retaining surface to be brought into close contact with the end surface (10a) of the spindle (10). The bottom grip taper shank (14) retains itself by the first and the second retaining surface on the spindle (10).
Description
TWO-SURFACE CONSTRAINABLE TOOL
BACKGROUND OF THE INVENTION
FIP~d of the Invention The present invention relates to a tool to be fitted to a spindle included in a machine tool, such as a machining center and,more particularly,to a two-surface constrainable tool having a bottom grip taper shank (BT shank) with a conical taper shank and a flange to be constrained.
Description of the Related Art BT shanks are used widely as shanks for standard tools for machining centers . The BT shank is mounted on s spindle with its taper shank f fitted closely in the conical taper bore of the spindle. The recent progress of machining centers which achieve high performance in spindle speed and machining efficiency has brought about new problems in BT
shanks. For example, a front end portion of the spindle surrounding the conical taper bore is caused to expand because of its high speed rotation and the tool holding firmness of the spindle is reduced. Consequently, the tool becomes unstable and chatters, and the positional accuracy of the cutting edge of the tool is deteriorated.
A new tool which has a BT shank with a taper part and a flange has been developed to solve such a problem. The taper part of the BT shank is fitted closely in the conical taper hole of a spindle and the flange is brought into contact with the end surface of the spindle to hold the tool securely on the spindle in a state of two-surface constraint. Known two-surface constrainable tools are shown in Figs . 6 and 7 .
Fig. 6 shows a two-surface constrainable tool known as a collar adjustment type. In Fig. 6 indicated at 30 is a spindle and at 32 is a BT shank. A taper part 33 of the BT
shank 32 is fitted in a conical taper bore 31 formed in the spindle 30. A collar 35 is inserted into a clearance between the end surface of the spindle 30 and the end surface of a flange 34. According to the collar adjustment type, the taper part 33 of the tool is constrained by the inner surface of the conical taper bore 31, and the flange 34 of the same is constrained by the collar 35 in close contact with the end surface of the spindle 30.
Fig. 7 shows a two-surface constrainable tool known as of a century type. This tool has a BT shank 32 having a short taper part 36 and a flange 34. A disk spring 37 is placed in a clearance between the flange 34 and the end surface of a spindle 30 to facilitate pushing the short taper part 36 of the BT shank 32 into a taper bore formed in the spindle 30 and to enhance cutting vibration damping effect.
As to the BT shank 32 of the collar adjustment type retained in the two-surface constrained state, the collar 35 subjected to the centrifugal force is caused to loosen and the stiffness of contact between the collar 35 and the end surface of the spindle 30 decreases when the spindle 30 rotates at a high rotating speed.
On the other hand, the taper part 36 of the tool of the century type does not have a enough contact area to keep reliable contact with the surface of taper bore 31, and the tool is liable to play axially. There is an opinion that the tool of a century type is unsuitable for high-speed heavy machining.
MAMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to solve those problems in the prior art and to provide a two-surface constrainable tool capable of securely holding a collar between the end surface of a spindle and the end surface of the flange without allowing the collar to loosen or fall off and of being used for high-speed machining.
According to one aspect of the present invention, a two-surface constrainable tool having two constrained surfaces on an end portion of a spindle provided with a conical tapered bore and an end surface, said two-surface constrainnable tool comprises a bottom grip taper shank having a taper part provided with a first constrained surface and capable of being closely fitted in the conical tapered :3 bore of the spindle, and a flange provided in one end surface thereof facing the end surface of the spindle with a groove;
and a collar to be interposed between the end surface of the flange and the end surface of the spindle, having a ridge to be fitted in the r~roove of the flange, and a second constrained surface to be brought into close contact with the end surface of the spindle.
When th.e bottom grip taper shank is mounted on the spindle, the tapered conical surface of the taper part in close conta<:t. with the :inner conical surface of the taper bore of the spindle serves as a first constrained surface, and the end surface of the flange resting through the collar on the end surface of the spindle serves as a second constrained surface. since the two-surface constrainable tool thus retains itself by the two retaining surfaces tin the spindle, the tool holding fixvmness of the spindle is not reduced even if the spindle rotates at a high rotating speed.
In another aspect, the prf~sent-_ inVenti;~n provides a two-surface constrainable tool ra~Jin_~ two surfaces to be constrained and being configur4~d to be mounted on an end portion of a spindle provide~a with a cor~ica:1 tapered bore and an end surface, said two-sur~ace constrainable tool comprising: a bottom grip taper shank having a taper part prcvided wn..t:re a f:ir:~t ccnstra:ined surface a.nd being configured to be closely fitted ir> the conical tapered borcV of the spindle, and a f,~ange provided in one end surface thereo=: Lacing the end surface of the spindle with a groov:~ ; and a :~o:i 1ar wri ch ,~s interpo:~ed between arid bears ag;~inst both tze end surface of the flange and the er~d surface a~f t=he snind;~e, raving a ridge to be fitted ir_ the :groove of the Flange and which, in cc~oper_atic:.r. w:t_lr said groc~re, acts t:o restrain the collar when said two-sur?_ace ccnstrair:able tool is in use.
In another aspect, the present invention provides a two-surface constrai.~<~.b ~e foci h.a~.~:ir~~ two ,~uri_aces to be 3a constrained and being c:onf iguret=1 too be mounted on an end portion of a spindle, sayd spin:ile having ar_ end surface and a conica:L tapered bare with a ccnica~., tvapered bore surface, said two-sur~ace consr_rainabi.e tool. comprising:
a bottom grip taper shark having a taper part provided with a f first ,. tapered ,:~~i::~face and beirvg conf _:.gured to be closely fitted in r_he conical t apered bore of the spindle with said f:.rst, tapered surface being constrained against r_.he bore ~~urface, said bottom grip taper shank further ~:za~~-ing a f range provided with a groove in an end su::rL:ace the;:ecf wr:ich fared~ the end surface of the spind.e when t.:~~. ~ot.tom grip taper shank is fitted ir_ the conical capered bore, the end surface of said flange con~t.itut~ing ;~ seacc.~r~d suz:face to :oe constrained when the 'r~o.-.tom grip taper shank is fitted in the conical tapered bore; and a remo~rable collar which fits around ::~a~c1 bottom crib t.apez: shank and which, when said botr_om grip taper shank :~s fitted in the conical tapered bor~a, i:: ~~r_terpcsed between and bears against Beth th.e end s~.~w:ac.:e oz= t~:lE: fianc;e and the end surface of the spind~.e to ~.:cr~strain the er~d surface of the flange, said :Jo..l.ar having a ridge which fits in the groove of tree flange <~nd which, i~ cooper<~tion with said groove, acts to restrain the collar when said two-surface constrainable tco,~ is =_n usa_ .
BRIEF DES~Rr_pT_rON of THE DR_AWr_N~,~
The above and other objects, features and advantages of the present invention ;gill become more apparent from the following description taken in connection with the accompanying drawings, in which:
Fig. :1 is a longit~udi.nal secaional view of a two-surface constrainable tool in a first embodiment according to the present invention;
BACKGROUND OF THE INVENTION
FIP~d of the Invention The present invention relates to a tool to be fitted to a spindle included in a machine tool, such as a machining center and,more particularly,to a two-surface constrainable tool having a bottom grip taper shank (BT shank) with a conical taper shank and a flange to be constrained.
Description of the Related Art BT shanks are used widely as shanks for standard tools for machining centers . The BT shank is mounted on s spindle with its taper shank f fitted closely in the conical taper bore of the spindle. The recent progress of machining centers which achieve high performance in spindle speed and machining efficiency has brought about new problems in BT
shanks. For example, a front end portion of the spindle surrounding the conical taper bore is caused to expand because of its high speed rotation and the tool holding firmness of the spindle is reduced. Consequently, the tool becomes unstable and chatters, and the positional accuracy of the cutting edge of the tool is deteriorated.
A new tool which has a BT shank with a taper part and a flange has been developed to solve such a problem. The taper part of the BT shank is fitted closely in the conical taper hole of a spindle and the flange is brought into contact with the end surface of the spindle to hold the tool securely on the spindle in a state of two-surface constraint. Known two-surface constrainable tools are shown in Figs . 6 and 7 .
Fig. 6 shows a two-surface constrainable tool known as a collar adjustment type. In Fig. 6 indicated at 30 is a spindle and at 32 is a BT shank. A taper part 33 of the BT
shank 32 is fitted in a conical taper bore 31 formed in the spindle 30. A collar 35 is inserted into a clearance between the end surface of the spindle 30 and the end surface of a flange 34. According to the collar adjustment type, the taper part 33 of the tool is constrained by the inner surface of the conical taper bore 31, and the flange 34 of the same is constrained by the collar 35 in close contact with the end surface of the spindle 30.
Fig. 7 shows a two-surface constrainable tool known as of a century type. This tool has a BT shank 32 having a short taper part 36 and a flange 34. A disk spring 37 is placed in a clearance between the flange 34 and the end surface of a spindle 30 to facilitate pushing the short taper part 36 of the BT shank 32 into a taper bore formed in the spindle 30 and to enhance cutting vibration damping effect.
As to the BT shank 32 of the collar adjustment type retained in the two-surface constrained state, the collar 35 subjected to the centrifugal force is caused to loosen and the stiffness of contact between the collar 35 and the end surface of the spindle 30 decreases when the spindle 30 rotates at a high rotating speed.
On the other hand, the taper part 36 of the tool of the century type does not have a enough contact area to keep reliable contact with the surface of taper bore 31, and the tool is liable to play axially. There is an opinion that the tool of a century type is unsuitable for high-speed heavy machining.
MAMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to solve those problems in the prior art and to provide a two-surface constrainable tool capable of securely holding a collar between the end surface of a spindle and the end surface of the flange without allowing the collar to loosen or fall off and of being used for high-speed machining.
According to one aspect of the present invention, a two-surface constrainable tool having two constrained surfaces on an end portion of a spindle provided with a conical tapered bore and an end surface, said two-surface constrainnable tool comprises a bottom grip taper shank having a taper part provided with a first constrained surface and capable of being closely fitted in the conical tapered :3 bore of the spindle, and a flange provided in one end surface thereof facing the end surface of the spindle with a groove;
and a collar to be interposed between the end surface of the flange and the end surface of the spindle, having a ridge to be fitted in the r~roove of the flange, and a second constrained surface to be brought into close contact with the end surface of the spindle.
When th.e bottom grip taper shank is mounted on the spindle, the tapered conical surface of the taper part in close conta<:t. with the :inner conical surface of the taper bore of the spindle serves as a first constrained surface, and the end surface of the flange resting through the collar on the end surface of the spindle serves as a second constrained surface. since the two-surface constrainable tool thus retains itself by the two retaining surfaces tin the spindle, the tool holding fixvmness of the spindle is not reduced even if the spindle rotates at a high rotating speed.
In another aspect, the prf~sent-_ inVenti;~n provides a two-surface constrainable tool ra~Jin_~ two surfaces to be constrained and being configur4~d to be mounted on an end portion of a spindle provide~a with a cor~ica:1 tapered bore and an end surface, said two-sur~ace constrainable tool comprising: a bottom grip taper shank having a taper part prcvided wn..t:re a f:ir:~t ccnstra:ined surface a.nd being configured to be closely fitted ir> the conical tapered borcV of the spindle, and a f,~ange provided in one end surface thereo=: Lacing the end surface of the spindle with a groov:~ ; and a :~o:i 1ar wri ch ,~s interpo:~ed between arid bears ag;~inst both tze end surface of the flange and the er~d surface a~f t=he snind;~e, raving a ridge to be fitted ir_ the :groove of the Flange and which, in cc~oper_atic:.r. w:t_lr said groc~re, acts t:o restrain the collar when said two-sur?_ace ccnstrair:able tool is in use.
In another aspect, the present invention provides a two-surface constrai.~<~.b ~e foci h.a~.~:ir~~ two ,~uri_aces to be 3a constrained and being c:onf iguret=1 too be mounted on an end portion of a spindle, sayd spin:ile having ar_ end surface and a conica:L tapered bare with a ccnica~., tvapered bore surface, said two-sur~ace consr_rainabi.e tool. comprising:
a bottom grip taper shark having a taper part provided with a f first ,. tapered ,:~~i::~face and beirvg conf _:.gured to be closely fitted in r_he conical t apered bore of the spindle with said f:.rst, tapered surface being constrained against r_.he bore ~~urface, said bottom grip taper shank further ~:za~~-ing a f range provided with a groove in an end su::rL:ace the;:ecf wr:ich fared~ the end surface of the spind.e when t.:~~. ~ot.tom grip taper shank is fitted ir_ the conical capered bore, the end surface of said flange con~t.itut~ing ;~ seacc.~r~d suz:face to :oe constrained when the 'r~o.-.tom grip taper shank is fitted in the conical tapered bore; and a remo~rable collar which fits around ::~a~c1 bottom crib t.apez: shank and which, when said botr_om grip taper shank :~s fitted in the conical tapered bor~a, i:: ~~r_terpcsed between and bears against Beth th.e end s~.~w:ac.:e oz= t~:lE: fianc;e and the end surface of the spind~.e to ~.:cr~strain the er~d surface of the flange, said :Jo..l.ar having a ridge which fits in the groove of tree flange <~nd which, i~ cooper<~tion with said groove, acts to restrain the collar when said two-surface constrainable tco,~ is =_n usa_ .
BRIEF DES~Rr_pT_rON of THE DR_AWr_N~,~
The above and other objects, features and advantages of the present invention ;gill become more apparent from the following description taken in connection with the accompanying drawings, in which:
Fig. :1 is a longit~udi.nal secaional view of a two-surface constrainable tool in a first embodiment according to the present invention;
3 i~
Fig. 2 i.s an end view of the two-surface constrainable tool shown in Fig. 1 taken in the direction of the arrow in Fig. 1;
Fig. 3 is a longitudinal sectional view of a two-surface constrainable tool in <~ second embodiment according to th.e present invention;
Fig. 4 is an enlarged view of a part A in Fig. 3;
Fig. '_i is a. front view of a collar;
Fig. 6 is a side e7.evation of a conventional two-surface const:rainab:le tool; arid Fig. 7 is a side elevation of another conventional two-surface constrainable tool.
DESGRTpTTON OF THE PREFERRED EMBODT_MENTS
Fig. 1 shows a two-surface constrainable tool in a first embodiment according to the present invention in a longitudinal sectional view, a spindle l0of a machine tool has a taper bore 12 with a inner conical surface. The two-surface constrainable tool has a BT shank 14 which has a taper part 15 with a tapered conical surface formed in one end part thereof . When the taper part 15 is inserted in the taper bore 12 of the spindle 10, the tapered conical surface of the taper part 15 comes into close contact with the inner conical surface of the taper bore 12. The BT shank 14 is provided with a flange 16 continuous with a base end part of the taper part 15. A cutting part, not shown, is attached to the other end part of the BT shank 14.
The flange 16 of the BT shank 14 has an end surface 16a which extends in parallel to the end surface 10a of the spindle 10 when the taper part 15 of the BT shank 14 is fitted in the taper bore 12 of the spindle 10. An annular groove 18 is formed in the end surface 16a of the flange 16 so as to surround the base end part of the taper part 15. As shown in Fig.2, a collar 20 consisting of a pair of segments 20a and 20b is fitted in a clearance between the end surface of the spindle 10 and the end surface 16a of the flange 16. The thickness of the collar 20 is specific to the two-surface constrainable tool in use.
The collar segments 20a and 20b have the shape of a symmetrical half of a circular ring as shown in Fig. 2. The outside and the inside diameter of the collar 20 are approximately equal to the outside and the inside diameter of the end surface 16a of the flange 16.
The collar segments 22a and 22b of the collar 20 are provided with circular ridges 22a and 22b, respectively, extending circumferentially around the inner circumference of the collar 20. The circular ridges 22a and 22b are adapted to be fitted in an annular groove 18 formed circumferentially in the end surface 16a of the flange 16.
As shown in Fig. 1, the BT shank 14 is mounted on the spindle 10 with the collar segments 20a and 20b of the collar 20 being interposed between the end surface 10a of the spindle 5 10 and the end surface 16a of the flange 16. A draw bar, not shown, connected to a clamping mechanism which generates a clamping force, and a collet attachment connected, not shown, connected to the draw bar are disposed in the spindle 10.
The collet attachment holds a pull stud attached to an end of the flange 16, and a high clamping force is exerted on the draw bar to pull the BT shank 14 into the spindle 10 inwardly.
When the BT shank 14 is clamped on the spindle 10, the tapered conical surface of the taper part 15, which is kept in reliable close contact with the inner conical surface of the taper bore 12, serves as a first constrained surface.
The end surface 16a of the flange 16, which rests through the collar segments 20a and 20b of the collar 20 on the end surface 10a of the spindle 10, serves as a second constrained surface. Since the BS shank 14 retains itself on the spindle 10 by the first and the second retaining surface, the BT shank 14 can securely be held on the spindle 10 even if the spindle 10 rotates at a ultra-high rotating speed.
Since the circular ridges 22a and 22b of the collar segments 20a and 20b are fitted in the annular groove 18 formed in the end surface 16a of the flange 16, the firmness of engagement of the segments 20a and 20b with the flange 16 can be strengthned as centrifugal force acting on the collar segments 20a and 20b grows greater with the increase of the rotating speed of the spindle 10. Therefore, the collar segments 20a and 20b will not become loose or suffered a damage and will not fall off . Since the entire contact area of the tapered conical surface of the taper bore 12 can be used for constraining the taper part 15, the BT shank 14 is deterred from axial movement relative to the spindle 10.
A two-surface retainable tool in a second embodiment according to the present invention will be described with reference to Figs . 3 to 5, in which parts like or corresponding to those of the first embodiment shown in Figs. 1 and 2 are designated by the same reference characters.
The two-surface constrainable tool in the second embodiment has a collar 20 consisting of collar segments 20a and 20b respectively with circular ridges 22a and 2b as same as the first embodiment. But the collar segments 20a and 20b are provided, respectively, with magnets 24a and 24b embedded in a surface thereof on the same side of the circular ridges 22a and 22b so as to attach the segments 20a and 20b magnetically attached to a BT shaft 14. The surfaces of the magnets 24a and 24b are flush with the surfaces of the segments 20a and 20b, respectively. The segments 20a and 20b can be attached to and end surface 16a of the flange 16 with ease by the magnetic attraction of the magnets 24a and 24b simply by putting the segments 20a and 20b on the end surface 16a with the circular ridges 22a and 22b fitted in the annular groove 18 formed in the end surface 16a of the flange 16.
As is apparent from the foregoing description, according to the present invention, the collar held between the end surface of the flange of the BT shank and the end surface of the spindle will not become loose and will not come off, and the two-surface constrainable tool can be securely retained itself on the spindle for high-speed machining operation.
Although the invention has been described in its preferred embodiments with a certain degree of particularity, obviously many changes and variations are possible therein.
It is therefore to be understood that the present invention may be practiced otherwise than as specifically described herein without departing from the scope and spirit thereof .
Fig. 2 i.s an end view of the two-surface constrainable tool shown in Fig. 1 taken in the direction of the arrow in Fig. 1;
Fig. 3 is a longitudinal sectional view of a two-surface constrainable tool in <~ second embodiment according to th.e present invention;
Fig. 4 is an enlarged view of a part A in Fig. 3;
Fig. '_i is a. front view of a collar;
Fig. 6 is a side e7.evation of a conventional two-surface const:rainab:le tool; arid Fig. 7 is a side elevation of another conventional two-surface constrainable tool.
DESGRTpTTON OF THE PREFERRED EMBODT_MENTS
Fig. 1 shows a two-surface constrainable tool in a first embodiment according to the present invention in a longitudinal sectional view, a spindle l0of a machine tool has a taper bore 12 with a inner conical surface. The two-surface constrainable tool has a BT shank 14 which has a taper part 15 with a tapered conical surface formed in one end part thereof . When the taper part 15 is inserted in the taper bore 12 of the spindle 10, the tapered conical surface of the taper part 15 comes into close contact with the inner conical surface of the taper bore 12. The BT shank 14 is provided with a flange 16 continuous with a base end part of the taper part 15. A cutting part, not shown, is attached to the other end part of the BT shank 14.
The flange 16 of the BT shank 14 has an end surface 16a which extends in parallel to the end surface 10a of the spindle 10 when the taper part 15 of the BT shank 14 is fitted in the taper bore 12 of the spindle 10. An annular groove 18 is formed in the end surface 16a of the flange 16 so as to surround the base end part of the taper part 15. As shown in Fig.2, a collar 20 consisting of a pair of segments 20a and 20b is fitted in a clearance between the end surface of the spindle 10 and the end surface 16a of the flange 16. The thickness of the collar 20 is specific to the two-surface constrainable tool in use.
The collar segments 20a and 20b have the shape of a symmetrical half of a circular ring as shown in Fig. 2. The outside and the inside diameter of the collar 20 are approximately equal to the outside and the inside diameter of the end surface 16a of the flange 16.
The collar segments 22a and 22b of the collar 20 are provided with circular ridges 22a and 22b, respectively, extending circumferentially around the inner circumference of the collar 20. The circular ridges 22a and 22b are adapted to be fitted in an annular groove 18 formed circumferentially in the end surface 16a of the flange 16.
As shown in Fig. 1, the BT shank 14 is mounted on the spindle 10 with the collar segments 20a and 20b of the collar 20 being interposed between the end surface 10a of the spindle 5 10 and the end surface 16a of the flange 16. A draw bar, not shown, connected to a clamping mechanism which generates a clamping force, and a collet attachment connected, not shown, connected to the draw bar are disposed in the spindle 10.
The collet attachment holds a pull stud attached to an end of the flange 16, and a high clamping force is exerted on the draw bar to pull the BT shank 14 into the spindle 10 inwardly.
When the BT shank 14 is clamped on the spindle 10, the tapered conical surface of the taper part 15, which is kept in reliable close contact with the inner conical surface of the taper bore 12, serves as a first constrained surface.
The end surface 16a of the flange 16, which rests through the collar segments 20a and 20b of the collar 20 on the end surface 10a of the spindle 10, serves as a second constrained surface. Since the BS shank 14 retains itself on the spindle 10 by the first and the second retaining surface, the BT shank 14 can securely be held on the spindle 10 even if the spindle 10 rotates at a ultra-high rotating speed.
Since the circular ridges 22a and 22b of the collar segments 20a and 20b are fitted in the annular groove 18 formed in the end surface 16a of the flange 16, the firmness of engagement of the segments 20a and 20b with the flange 16 can be strengthned as centrifugal force acting on the collar segments 20a and 20b grows greater with the increase of the rotating speed of the spindle 10. Therefore, the collar segments 20a and 20b will not become loose or suffered a damage and will not fall off . Since the entire contact area of the tapered conical surface of the taper bore 12 can be used for constraining the taper part 15, the BT shank 14 is deterred from axial movement relative to the spindle 10.
A two-surface retainable tool in a second embodiment according to the present invention will be described with reference to Figs . 3 to 5, in which parts like or corresponding to those of the first embodiment shown in Figs. 1 and 2 are designated by the same reference characters.
The two-surface constrainable tool in the second embodiment has a collar 20 consisting of collar segments 20a and 20b respectively with circular ridges 22a and 2b as same as the first embodiment. But the collar segments 20a and 20b are provided, respectively, with magnets 24a and 24b embedded in a surface thereof on the same side of the circular ridges 22a and 22b so as to attach the segments 20a and 20b magnetically attached to a BT shaft 14. The surfaces of the magnets 24a and 24b are flush with the surfaces of the segments 20a and 20b, respectively. The segments 20a and 20b can be attached to and end surface 16a of the flange 16 with ease by the magnetic attraction of the magnets 24a and 24b simply by putting the segments 20a and 20b on the end surface 16a with the circular ridges 22a and 22b fitted in the annular groove 18 formed in the end surface 16a of the flange 16.
As is apparent from the foregoing description, according to the present invention, the collar held between the end surface of the flange of the BT shank and the end surface of the spindle will not become loose and will not come off, and the two-surface constrainable tool can be securely retained itself on the spindle for high-speed machining operation.
Although the invention has been described in its preferred embodiments with a certain degree of particularity, obviously many changes and variations are possible therein.
It is therefore to be understood that the present invention may be practiced otherwise than as specifically described herein without departing from the scope and spirit thereof .
Claims (10)
1. A two-surface constrainable tool having two surfaces to be constrained and being configured to be mounted on an end portion of a spindle provided with a conical tapered bore and an end surface, said two-surface constrainable tool comprising:
a bottom grip taper shank having a taper part provided with a first constrained surface and being configured to be closely fitted in the conical tapered bore of the spindle, and a flange provided in one end surface thereof facing the end surface of the spindle with a groove; and a collar which is interposed between and bears against both the end surface of the flanged and the end surface of the spindle, having a ridge to be fitted in the groove of the flange and which, in cooperation with said groove, acts to restrain the collar when said two-surface constrainable tool is in use.
a bottom grip taper shank having a taper part provided with a first constrained surface and being configured to be closely fitted in the conical tapered bore of the spindle, and a flange provided in one end surface thereof facing the end surface of the spindle with a groove; and a collar which is interposed between and bears against both the end surface of the flanged and the end surface of the spindle, having a ridge to be fitted in the groove of the flange and which, in cooperation with said groove, acts to restrain the collar when said two-surface constrainable tool is in use.
2. The two-surface constrainable tool according to claim 1, wherein the collar is circular, and the ridge is circular extending along the inner circumference of the circular collar.
3. The two-surface constrainable tool according to claim 2, wherein tree collar consists of two symmetrical parts.
4. The two-surface constrainable tool according to claim 2, wherein the collar is provided with magnets to hold the collar on the end surface of the flange by magnetic attraction.
5. The two-surface constrainable tool according to claim 4, wherein the magnets are embedded in a surface of the collar from which the ridge rises so that the surfaces of the magnets are flush with the same surface of the collar.
6. A two-surface constrainable tool having two surfaces to be constrained and being configured to be mounted on an end portion of a spindle, said spindle having an end surface and a conical tapered bore with a conical, tapered bore surface, said two-surface constrainable tool comprising:
a bottom grip taper shank having a taper part provided with a first, tapered surface and being configured to be closely fitted in the conical tapered bore of the spindle with said first, tapered surface being constrained against the bore surface, said bottom grip taper shank further having a flange provided with a groove in an end surface thereof which faces the end surface of the spindle when the bottom grip taper shank is fitted in the conical tapered bore, the end surface of said flange constituting a second surface to be constrained when the bottom grip taper shank is fitted in the conical tapered bore; and a removable collar which fits around said bottom grip taper shank and which, when said bottom grip taper shank is fitted in the conical tapered bore, is interposed between and bears against both the end surface of the flange and the end surface of the spindle to constrain the end surface of the flange, said collar having a ridge which fits in the groove of the flange and which, in cooperation with said groove, acts to restrain the collar when said two-surface constrainable tool is in use.
a bottom grip taper shank having a taper part provided with a first, tapered surface and being configured to be closely fitted in the conical tapered bore of the spindle with said first, tapered surface being constrained against the bore surface, said bottom grip taper shank further having a flange provided with a groove in an end surface thereof which faces the end surface of the spindle when the bottom grip taper shank is fitted in the conical tapered bore, the end surface of said flange constituting a second surface to be constrained when the bottom grip taper shank is fitted in the conical tapered bore; and a removable collar which fits around said bottom grip taper shank and which, when said bottom grip taper shank is fitted in the conical tapered bore, is interposed between and bears against both the end surface of the flange and the end surface of the spindle to constrain the end surface of the flange, said collar having a ridge which fits in the groove of the flange and which, in cooperation with said groove, acts to restrain the collar when said two-surface constrainable tool is in use.
7. The two-surface constrainable tool according to claim 1, wherein the collar is circular, and the ridge is circular and extending along the inner circumference of the circular collar.
8. The two-surface constrainable tool according to claim 7, wherein the cellar consists of two symmetrical parts.
9. The two-surface constrainable tool according to claim 7, wherein the collar is provided with magnets to hold the collar on the end surface of the flange by magnetic attraction.
10. The two-surface constrainable tool according to claim 9, wherein the magnets are embedded in a surface of the collar from which the ridge rises so that the surfaces of the magnets are flush with the same surface of the collar.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP263445/1998 | 1998-09-17 | ||
| JP26344598A JP3231712B2 (en) | 1998-09-17 | 1998-09-17 | Two-sided constraint tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2282221A1 CA2282221A1 (en) | 2000-03-17 |
| CA2282221C true CA2282221C (en) | 2003-08-19 |
Family
ID=17389618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002282221A Expired - Fee Related CA2282221C (en) | 1998-09-17 | 1999-09-16 | Two-surface constrainable tool |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6231282B1 (en) |
| JP (1) | JP3231712B2 (en) |
| KR (1) | KR100321193B1 (en) |
| CA (1) | CA2282221C (en) |
| TW (1) | TW467782B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104029033A (en) * | 2014-04-08 | 2014-09-10 | 宁波旭升机械有限公司 | Standard processing bottom plate of processing center |
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|---|---|---|---|---|
| WO2002049791A1 (en) | 2000-12-18 | 2002-06-27 | Cardemon Inc., D/B/A Car-Tec Company | Adjustment method and apparatus for a boring tool |
| US20030134731A1 (en) * | 2001-03-21 | 2003-07-17 | Big Alpha Co., Inc. | Automatic-tool-changer-equipped lathe |
| JP3998958B2 (en) * | 2001-12-11 | 2007-10-31 | 東芝機械株式会社 | Tool holder |
| JP3704320B2 (en) * | 2002-03-18 | 2005-10-12 | 株式会社日研工作所 | Tool holder |
| AU2003231120A1 (en) * | 2002-04-25 | 2003-11-10 | Cardemon Inc., D/B/A Car-Tec Company | Slidable boring tool with fine adjustment |
| JP2004066443A (en) * | 2002-06-10 | 2004-03-04 | Nikken Kosakusho Works Ltd | Tool holder |
| JP3899324B2 (en) * | 2003-02-24 | 2007-03-28 | 株式会社日研工作所 | Tool holder |
| US7143490B2 (en) * | 2003-03-12 | 2006-12-05 | Kennametal Inc. | Tap process for hard workpieces |
| DE10336869A1 (en) * | 2003-08-11 | 2005-06-09 | Kennametal Inc. | tool coupling |
| US7160067B2 (en) * | 2004-07-13 | 2007-01-09 | Ford Motor Company | Tool holder assembly |
| US8118312B2 (en) * | 2006-06-14 | 2012-02-21 | American Torch Tip Co. | Quick change centering tool holder |
| US7393166B2 (en) * | 2006-08-07 | 2008-07-01 | Chin-Chiu Chen | Chuck in a processing machine |
| TWM350431U (en) * | 2008-09-03 | 2009-02-11 | Syntec Machinery Co Ltd | Adjustable securely-mounted tool bar of spindle |
| KR200449752Y1 (en) * | 2010-02-05 | 2010-08-06 | 이현주 | Modular type double face shrink fit chuck |
| JP5945818B2 (en) * | 2012-04-02 | 2016-07-05 | 国立大学法人鳥取大学 | Machine Tools |
| TWI625181B (en) * | 2016-12-27 | 2018-06-01 | Tool machine spindle anti-loose device and its combined structure | |
| TWI728411B (en) * | 2019-07-24 | 2021-05-21 | 財團法人工業技術研究院 | Detection device for spindle of machine tool and detection method for spindle of machine tool |
| CN113681043A (en) * | 2020-05-19 | 2021-11-23 | 东莞市国瑞切削工具有限公司 | Double-hole internal groove blade |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3504905A1 (en) * | 1985-02-13 | 1986-08-14 | J. Kühn GmbH & Co Präzisionswerkzeug KG, 4270 Dorsten | TOOL HOLDER OR THE LIKE |
| JPS61188041A (en) * | 1985-02-16 | 1986-08-21 | Mori Tekkosho:Kk | Main and sub tool shanks for machine tool |
| FR2623430B1 (en) * | 1987-11-23 | 1990-03-02 | Pfalzgraf Emile | CONICAL TAIL MOUNTING DEVICE, PARTICULARLY CONE 7/24, WITH CONE AND FACE APPLICATION FOR ATTACHMENTS, TOOL HOLDERS AND TOOLS |
| US4902177A (en) * | 1988-10-27 | 1990-02-20 | Terry K. Aitkens | Rapid change tool cutter and driving system |
| US5118231A (en) * | 1991-05-03 | 1992-06-02 | Daniels Edward J | Tool holder |
| US5322304A (en) * | 1993-04-15 | 1994-06-21 | Wayne State University | Tool holder-spindle connection |
| DE4402483A1 (en) * | 1993-12-23 | 1995-06-29 | Johne & Co Praezisionswerkzeug | Tool holder or the like |
| US5595391A (en) * | 1995-04-18 | 1997-01-21 | The Board Of Governors Of Wayne State University | Relating to tapered connections |
| US5975816A (en) * | 1997-07-09 | 1999-11-02 | Cook; Harold D. | Harmonic dampener for rotary tool holder |
-
1998
- 1998-09-17 JP JP26344598A patent/JP3231712B2/en not_active Expired - Fee Related
-
1999
- 1999-05-14 TW TW088107886A patent/TW467782B/en not_active IP Right Cessation
- 1999-05-20 KR KR1019990018164A patent/KR100321193B1/en not_active IP Right Cessation
- 1999-09-16 CA CA002282221A patent/CA2282221C/en not_active Expired - Fee Related
- 1999-09-17 US US09/398,420 patent/US6231282B1/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104029033A (en) * | 2014-04-08 | 2014-09-10 | 宁波旭升机械有限公司 | Standard processing bottom plate of processing center |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20000022634A (en) | 2000-04-25 |
| JP2000084709A (en) | 2000-03-28 |
| CA2282221A1 (en) | 2000-03-17 |
| JP3231712B2 (en) | 2001-11-26 |
| TW467782B (en) | 2001-12-11 |
| US6231282B1 (en) | 2001-05-15 |
| KR100321193B1 (en) | 2002-01-19 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |